One who or that which averts, turns away, prevents, or wards off something harmful.
From 'avert' (Latin 'avertere') + '-er' agent suffix. Describes either a person or thing capable of preventing or deflecting something undesirable.
In medieval times, religious objects like crosses or charms were called 'averters' of evil—they literally turned away supernatural threats. The concept survived into modern 'good luck charms.'
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